Nor ksh, which was the common shell for the SVr4 line (Solaris et al.). It has some extensions to sh that bash picked up, some that bash imitated just badly eno

Nor ksh, which was the common shell for the SVr4 line (Solaris et al.). It has some extensions to sh that bash picked up, some that bash imitated just badly enough to be incompatible, and some that bash never picked up (e.g. floating point expressions, which I use surprisingly often). The terminal emulator I use, mlterm, isn't on the list either. Its killer feature for me is a configuration that solves the vim ESC/Alt prefix problem.